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20W50 Motorcycle Oil

Your Harley wants better raws materials and more ZDDP than Amsoil brings.

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20W50 Motorcycle Oil
20W50 Motorcycle Oil
20W50 Motorcycle Oil

20W50 Motorcycle Oil

  • Designed for the latest Big-Twin motorcycle engines that specify 20W50 motor oil, including Evolution, Twin Cam, and aftermarket engines of similar design
  • Superior film strength through the use of ester base stocks for protection and ring seal
  • Extended drain intervals over other brands due to higher quality basestocks and excellent dispersants
  • Blended with specific friction modifiers that are compatible with wet-clutches, suitable for JASO MA applications
$15.95
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Produced in only one top-of-the-line grade, these products offer the highest quality available on the market today and in the widest variety of viscosity

  • Fully-synthetic ester formula for passenger cars, light trucks, performance vehicles and marine applications
  • Designed to provide the highest protection, efficiency, cleanliness and superior drain intervals
  • Excellent wear protection and friction reduction across a wide range of operating conditions
  • High detergency allows extended drain intervals and provides increased cleanliness
  • Improved fuel economy and ring seal for more power
  • Superior high temperature stability and oxidation resistance increases lubrication of hot metal compared to other synthetics
  • High natural viscosity index (VI) provides thicker oil film in bearings and cams
  • Less evaporation than other synthetics for improved efficiency and ring seal
  • Blended with polyol ester base stocks that feature natural multi-grade properties, avoiding unnecessary additives that hinder lubricity
  • All products are completely compatible with other conventional and synthetic motor oils

Data Sheet Downloads

Typical Properties

API Service Class SJ/SG/SH JASO MA
SAE Viscosity Grade (Motor Oil) 20W50
Vis @ 100°C, cSt 20.1
Vis @ 40°C, cSt 141
Viscosity Index 165
CCS Viscosity, Poise, @ °C 50@ -15
Pour Point, °C -45
Pour Point, °F -49
Zinc, avg PPM 2125
Phosphorus, avg PPM 2100
Molybdenum, avg PPM 425
NOACK Evaporation Loss,1hr @ 482°F (250°C), % 5
% Viscosity Loss, 30 Pass ASTM D6278 0
HTHS Vis, cP @150°C, ASTM D4741  6.1

Available Sizes

quart 42504
5 gallon* 42506
55 gallon* 42508

*Only available from our dealers

Milwaukee-Eight® and 2007-up H-D® motorcycles with the 96-inch engine, users must purchase one extra bottle of Primary Chain Case Oil to meet this engine's 38oz (45oz dry capacity), rather than the 32oz capacity of an Evolution® or V-Twin case.


Milwaukee-Eight®, H-D® and Evolution® are registered trademarks owned by H-D USA, LLC.